I get asked this question every Spring. When does Bermuda grass come back in Phoenix? Winter Rye transition to Bermuda grass in the Spring always causes dead transition spots where the Rye grass dies out and the dormant Bermuda grass needs to fill in. Increasing water and turf fertilizer are the most cost effective way to get through this 2-6 week period. Thinning these areas out with a thatcher or adding Bermuda seed or sod are even options. Please contact AMS Landscaping to set up lawn care service at (602) 944-0421 or go to our website at www.azlawns.com if you have any other question.